//: C17:ichar_traits.h
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Creating your own character traits
#ifndef ICHAR_TRAITS_H
#define ICHAR_TRAITS_H
#include <string>
#include <cctype>

struct ichar_traits : std::char_traits<char> {
    // We'll only change character by
    // character comparison functions
    static bool eq(char c1st, char c2nd) {
        return
            std::toupper(c1st) == std::toupper(c2nd);
    }
    static bool ne(char c1st, char c2nd) {
        return
            std::toupper(c1st) != std::toupper(c2nd);
    }
    static bool lt(char c1st, char c2nd) {
        return
            std::toupper(c1st) < std::toupper(c2nd);
    }
    static int compare(const char* str1,
                       const char* str2, size_t n) {
        for (int i = 0; i < n; i++) {
            if (std::tolower(*str1)>std::tolower(*str2))
                return 1;
            if (std::tolower(*str1)<std::tolower(*str2))
                return -1;
            if (*str1 == 0 || *str2 == 0)
                return 0;
            str1++;
            str2++; // Compare the other chars
        }
        return 0;
    }
    static const char* find(const char* s1,
                            int  n, char c) {
        while (n-- > 0 &&
                std::toupper(*s1) != std::toupper(c))
            s1++;
        return s1;
    }
};
#endif // ICHAR_TRAITS_H  ///:~
